“Sylvia” is a racy, action packed, fast moving, in-depth study about severely aerated human behavior. Not since “Three Faces of Eve” has a film attempted to so clearly define a true history of multiple personality.Sylvia D’Constant (Joanna Bell) is seemingly a quiet, reserved, saintly person living on a quiet, reserved well-manicured street in upper-middle class suburbia.From the opening of this film, the viewer becomes involved in the gamut of intrigue, twists, turns, and always the unexpected as we experience Sylvia.